change data store way from char pointer to std::string for dynamic
change data store way from char pointer to std::string for dynamic

cuhkshenzhen/CUHKSZLib,alesiong/CUHKSZLib,cuhkshenzhen/CUHKSZLib,cuhkshenzhen/CUHKSZLib,alesiong/CUHKSZLib,alesiong/CUHKSZLib